Tool for cutting mortises.



' Patented June 5, |900.

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(Application filed July 19, 1899.)

(No-Model.)

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MASSACHUSETTS, ASSIGNOR. TO l FREDERICK J. STARK, OF BOSTON, MASSACHUSETTS.

' TOOL FOR CUTTING NIORTISES'.

SPECIFICATION forming part of Letters Patent No. 651,81 5, dated June 5, 1900.

Application iiled July 19, 1899. Serial No. 724,350. (No model.)

To a/ZZ whom t may concern:

Be it known that I, ISAAC SGHURMAN, a citizen of the United States, residing at Danvers, in the county of Essex and Commonwealth of Massachusetts, have invented a new and useful Improvement in Tools for Cutting Mortises, of which the followingis a specification.

My invention consists of a tool provided with a gang of bits operating in the same plane and a gage for directing the course of the same, so as to quickly and accurately cut the mortise in the edge of a door for the reception of the lock.

In the accompanying drawings, illustrating my invention, Figure 1 is a front plan view. Fig. 2 is a longitudinal section through the line X Yin Fig. l.

A B C D E, respectively, represent five bits supported in bearings consisting of holes in the metal frame G G', made in two longitudinal sections, one of which, G, is secured to the wooden guide F by means of the bolts II I-I and the nuts H/ I-I, and the other section, G', is secured to the section G by the four screws I. The bearings for the bits are made by cutting half-round grooves in each of the sections G G', which match each other, and thereby form circular holes. The bits are readily removed and replaced, as desired, by taking off the section G. Fast upon the shank of each bit are two geais K K', connecting the bits together, so that the motion imparted to one is communicated to all. The shank of the bit C extends beyond the frame G G and has secured to it by a set-screw S a sleeve having a square end M, to which is applied any form of handle, such as a Wheel or brace. The bits A, C, and E are cut with right-hand threads, and the bits B and D are cut with left-hand threads, which is obviously necessary, without intermediate gears. A square opening O is cut in the guide F to allow the escape of shavings and other waste. Secured to the guide F is a handle Q. A thin strip of wood P is interposed between the guide F and frame G to vary the distance of the bits from-the face of the guide. There are three thicknesses of doors in common use, and I construct the frame G of such thickness that the bits are set at a distance from the guide which is fitted for the thinnest doors in general use. By the use of two dierent thicknesses of strips P the frame may be set at the required distance from the guide for the thickest and medium doors, respectively. These strips are clamped between the face of the guide F and the frame G, as shown. In using my tool the face of the guide extending beyond the points of the bits is laid against the door, and as the bits are worked into the edge of the door the guide, by means of the handle Q, is pushed along with its face held flat against the door, serving thereby as a guide to direct the bits at a uniform distance from the surface of the door. After boring into the edge of the door a requisite distance the bits are withdrawn and the mortise is chiseled out in regular form to receive thev lock. By the use of my tool the mortise can be rapidly and accurately cut and without the exercise of that care and skill whichv are required in the methods heretofore employed.

The purpose of my invention is to produce a simple and inexpensive tool which can be used without the difficulty and inconvenience of clamping it to the door. The essentiallynovel features consist of a guide F, extending beyond the bits a distance approximately as great as the length of the bits and forming a dat surface of considerable area beyond the ends of the bits, so as to obtain a firm bearing against th'e face of the door and accurately direct the entrance andV movement of the bits into the edge of the door, and of a frame, in which the bits are journaled, fixed to the guide, so that the planes of the surface of the guide and of the axes of the bits are maintained parallel to each other.

What I claim, and desire to secure by Letters Patent, is-

1. A tool for cutting mortises, consisting of a gang of bits journaled in a frame and having their axes located in the same plane and connected by gears so as to operate simultaneously, said frame being secured to a guide or holder F, and stationary thereon, said guide or holder being provided withv a stationary handle upon its rear surface and having a fiat surface adjacent to, and longer than the bits, and presenting a surface of considerable area beyond the ends of the bits, sufficient to form a iirm bearing against the face of the door,-

and extending beyond the bitsa sufiicient distance to form a firm bearing against the face of the door, the entire surface of said guide adjacent to the bits being maintained parallel i 5 to the plane of the axes of the bits, substantially as described.

ISAAC SCI'IRMAN. Witnesses CHAs. F. PERKNS, Y HERBERT W. TROWBRIDGE. 

